Paypal cart

[AWMImages]

I was wondering if I could use a cart like this:
http://www.widerange.org/cart/

Smugmugs cart is good but I am not a "pro" member so I can't change the prices! So I would like to implement a paypal option. It would be nice if I could have something like this (http://www.widerange.org/photo/uncompahgre-morning/?gallery=favorites) photographer has below his photo and then that take you to my cart which then ultimately takes you to paypal.

I dont know where to start and I am not sure if this is even possible to do this with smugmug!

Any ideas?

Site is here! (http://josiahlacellephoto.smugmug.com)